LT6211CDD datasheet(16/16 Pages) LINER

16 / 16 page

LT6210/LT6211

62101f

LT/TP 0204 1K • PRINTED IN USA

©LINEAR TECHNOLOGY CORPORATION 2003

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com

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TYPICAL APPLICATIO S

Figure 5. Line Driver with Low Power Mode

Figure 6. Frequency Response for Full

Speed and Low Power Mode

Line Driver with Power Saving Mode

In applications where low distortion or high slew rate are

desirable but not necessary at all times, it may be possible

to decrease the LT6210 or LT6211’s quiescent current

when the higher power performance is not required.

Figure 5 illustrates a method of setting quiescent current

with a FET switch. In the 5V dual supply case pictured,

shorting the ISET pin through an effective 20k to ground

sets the supply current to 6mA, while the 240k resistor at

the ISET pin with the FET turned off sets the supply current

to approximately 1mA. The feedback resistor of 4.02k is

selected to minimize peaking in low power mode. The

bandwidth of the LT6210 in this circuit increases from

about 40MHz in low power mode to over 200MHz in full

speed mode, as illustrated in Figure 6. Other AC specs also

improve significantly at the higher current setting. The

following table shows harmonic distortion at 1MHz with a

2VP-P sinusoid at the two selected current levels.

Harmonic Distortion

LOW POWER

FULL SPEED

HD2

–53dBc

HD2

–68dBc

HD3

–46dBc

HD3

–77dBc

FREQUENCY (MHz)

–4

–2

–1

100

1000

6210 F06

–6

–3

–5

FULL

SPEED

MODE

IS = 6mA

LOW POWER

MODE

IS = 1mA

TA = 25°C

VOUT = 100mVP-P

–

LT6210

240k

22k

RLOAD

150

Ω

VOUT

6210 F05

–5V

4.02k

HS/LP

VIN

2N7002

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